Dobutsu Bancho

The premise of the game is simple: Eat or be eaten. In Cubivore, you'll assume the role of an animal in its early stages of development. From the moment the game begins, your creature is on its own to fend for its life. As your animal instincts take over, you will boldly traverse hostile environments, savagely stalking your prey and asserting your place in the animal chain of power. Explore a number of different environments while consuming other animals in order to evolve into one of 100 possible creature combinations. Ultimately, the goal is to become powerful enough to topple the alpha creature and earn your rightful place at the top of the food chain.

Source: TheGamesDB